Hard-working engines come in all shapes and sizes, from heavy-duty diesels
to high performance racing engines. Though seldom recognized as part of
this group, marine engines include some of the hardest working, hottest
running engines out there.

Marine engines, from those found in recreational watercraft to larger
commercial boats, often sit idle in storage for weeks or months and when
put on the water are required to run at full throttle for extended periods
of time. These torturous conditions place tremendous stress on engines and
engine oils. Since clean engine oil is critical for ensuring proper
operation and protection, AMSOIL recommends the use of the Marine Dual
Remote Filtration System (BMK-18). PDF

The AMSOIL Dual Remote and By-Pass filtration systems have been an
integral part of the company's advanced engine protection product line.
Building on the customer-proven success of auto- motive dual remote and
by-pass filtration technology, the Marine Dual Remote Filtration System
was created to address the specific severe operating environment of marine
engines in both salt and fresh water. For example, the hoses are U.S.
Coast Guard approved, the fasteners and the mounting brackets on the BMK-18 are stainless steel and the connectors are aluminum making them
significantly corrosion resistant. Specifically designed for recreational
and light commercial marine applications that use in both or
inboard/outboard stern drive engines, the Marine Dual Remote Filtration
system offers easily accessible remote mounting capability for a full flow
spin-on oil filter and a spin-on style by-pass oil filter. This unique
combination of both full flow and by-pass filtration on a single mounting
manifold is the only system of this kind designed specifically for marine
applications.

The effects of marine engines running predominantly at or near full
throttle after extended periods of non- activity include high operating
temperatures and increased potential for wear on engine components. The
AMSOIL Marine Dual Remote Filtration System offers a clear advantage by
providing better oil filtration, increased oil capacity, longer oil and
filter life, plus the ability to remove moisture and condensation from the
lubrication system. Moisture typically condenses inside engines to combine
with residual combustion gases. The resulting compounds strip beneficial
additives from engine oil and act as corrosive substances that further
degrade the engine oil and promote engine wear. Humid environments make
marine engines especially prone to these conditions. The BMK-18 greatly
curbs the effects of moisture and condensation by safely retaining water
within the filtration system.

Dual remote filtration is a highly efficient filtering process capable
of removing the vast majority of wear causing particles which are in the
5-20 micron range. It also has the ability to remove particles down to 1
micron in size. Furthermore, a dual remote filtration system requires a
1.5 to 2 quart oil volume increase, with the added oil offering increased
cooling capabilities. The additional hoses, fittings, filters and aluminum
mount assemblies also allow the engine oil to dissipate heat more
efficiently as it passes through the filtration system, extending the life
of both the engine and the engine oil.

A large number of marine diesel engines have by-pass oil filtration
systems installed by the engine manufacturer. Until now, however, this technology has not been available to smaller pleasure boats and light
commercial marine applications.
Depending on the owner's frequency of use, the improved filtration of the Marine Dual Remote system, along with the use of AMSOIL synthetic lubricants, could completely eliminate oil and filter changes during a typical boating season.

With marine engines located in a relatively confined and remote space within the watercraft, ease of filter access and-reduced oil spillage are significant benefits of the Marine Dual Remote System.
The BMK-18 is packaged in kit form, which includes the Dual Filter mount, mounting hard- ware, hoses, hose fittings, component parts and installation instructions. In addition, adapter kits of four different sizes enable the BMK-18 to be installed on a wide variety of recreational and light commercial marine engines.
The AMSOIL Marine Dual Remote Filtration System represents the cutting edge of filtration technology-another example of the
company's commitment to providing quality innovations that can benefit consumers everywhere.
The BMK-18 Adapter Kit Reference Guide (G-2051) can be found online at www.amsoil.com

Four-stroke
gasoline engines have long been a mainstay of the general marine industry.
They have succeeded in reducing emissions and increasing fuel efficiency,
and they have also been a hit with consumers. In fact, Mercury Marine has
seen its four-stroke outboard sales surpass its two-stroke sales. When
four-stroke outboard motors were introduced to the market, manufacturers
recommended either their own specially formulated oil or an API SG or SL
automotive oil. However, because the specific lubrication requirements of
automobiles and outboard motors are different, it soon became apparent
that four-stroke outboard motors would require their own oil
specification. This standard, entitled FC-W, was released by the National
Marine Manufacturers Association (NMMA) in August 2004.

Four-stroke
engines in inboard and sterndrive power plants feature horizontally
mounted crankshafts, retaining a small level of oil in the bottom of the
crankshaft bearings upon shutdown. This residual oil helps protect the
bearings until the oil pump can supply additional oil volume. However, the
design configurations of four-stroke outboard motors present a challenge
to marine lubricants. Four-stroke outboards feature vertically mounted
crankshafts, limiting oil retention at shutdown and increasing the
likelihood of dry starts and accelerated wear. Formula 4-Stroke® Marine
Synthetic Motor Oils contain a high concentration of premium quality
anti-wear additives that provide an extra level of wear control upon
start-up.

Excellent
Anti-Rust Performance

Marine
engines are prone to rust, leading to uncontrolled wear and premature
engine failure. However, good rust protection is not a natural attribute
of engine oil. It comes only by design. Formula 4-Stroke® Marine
Synthetic Motor Oils contain maximum treatments of special rust and
corrosion inhibitors that ensure long-lasting engine protection during
both idle and storage periods.

Applications

AMSOIL
Formula 4-Stroke® Marine Synthetic 10W-30 (WCT) and 10W-40 (WCF) Motor
Oils are FC-W registered and warranty certified for use in four-stroke
outboard motors. They surpass the FC-W four-stroke outboard motor
performance requirements established by the National Marine Manufacturers
Association (NMMA) and are recommended for gasoline-fueled four-stroke
outboard, inboard, stern drives (inboard/outboards) and personal
watercraft motors. Use the appropriate viscosity grade where specified in
the following: